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Materials 2018, 11(7), 1199; https://doi.org/10.3390/ma11071199

Strong Dependence of Surface Enhanced Raman Scattering on Structure of Graphene Oxide Film

1
School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
2
Jiangsu Graphene Inspection Technology Key Laboratory, Jiangsu Province Special Equipment Safety Supervision and Inspection Institute Branch of Wuxi, Wuxi 214174, China
*
Author to whom correspondence should be addressed.
Received: 5 June 2018 / Revised: 25 June 2018 / Accepted: 9 July 2018 / Published: 12 July 2018
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Abstract

Graphene and its derivatives have been demonstrated to be good surface-enhanced Raman scattering (SERS) substrates. However, the literature offers some contrasting views on the SERS effect of graphene-based materials. Thus, understanding the mechanism of the SERS enhancement of graphene is essential for exploring its application as a SERS substrate. In this study, graphene oxide (GO) and chemically reduced graphene oxide (CRGO) films with different morphologies and structures were prepared and applied as SERS substrates to detect Raman dye molecules. The observed enhancement factors can be as large as 10~103. The mechanism of SERS enhancement is discussed. It is shown that the SERS effect was independent of the adsorption of dye molecules and the surface morphologies of graphene-based films. Raman shifts are observed and are almost the same on different graphene-based films, indicating the existence of charge transfer between dye molecules and substrates. The Raman enhancement factors and sensitivities of dye molecules on different films are consistently within the IG/ID ratios of graphene-based substrates, indicating that the dramatically enhanced Raman spectra on graphene-based films are strongly dependent on the average size of sp2 carbon domain. View Full-Text
Keywords: graphene oxide; graphene; surface-enhanced Raman scattering (SERS); oxygen-containing groups; chemical enhancement; sp2 carbon domain graphene oxide; graphene; surface-enhanced Raman scattering (SERS); oxygen-containing groups; chemical enhancement; sp2 carbon domain
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Wang, L.; Zhang, Y.; Yang, Y.; Zhang, J. Strong Dependence of Surface Enhanced Raman Scattering on Structure of Graphene Oxide Film. Materials 2018, 11, 1199.

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